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Stones in ears and Sea conditions

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Dix
1360148.  Sat Oct 10, 2020 5:45 am Reply with quote

By collecting stones from cod's ears you can tell a lot about how cods are doing, and that tells you about sea conditions. If you do this over 100 years or so, you get a pretty good picture of how living conditions in the sea have changed.

It's a bit like dendochronology. A layer is added to the stone every year. If the cod is doing well, the layer is thick, if not, it's thinner.
There's a "library of cod stones" available for research, and there are millions of stones in it.

If the population is doing well, individual cods have a better chance of living longer, so the proportion of older vs younger cod caught plus changes in catch size over time gives information too. This can be correlated with other information such as temperature changes and fishing fleet sizes.

NRK news (nice photos), in Norwegian
A bit more in-depth article from the Norwegian Marine research institute (also in Norwegian)

Research article in English:
A century of fish growth in relation to climate change, population dynamics and exploitation

 
PDR
1360156.  Sat Oct 10, 2020 8:05 am Reply with quote

I know cod have balls and fingers, but I never realised they had ears...

PDR

 
Dix
1360160.  Sat Oct 10, 2020 8:37 am Reply with quote

They're not deaf, so yes, they have.
I couldn't be bothered to specify "inner ear" :-)

 
Alexander Howard
1360161.  Sat Oct 10, 2020 8:43 am Reply with quote

Between the two of you, you are experts on codpieces.

 

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